Transitional Cell Carcinoma of the Urinary Tract in Dogs

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Transitional Cell Carcinoma of the Renal, Bladder and Urethra in Dogs

Transitional cell carcinoma (TCC) is a malignant (aggressive) and metastasizing (spreading) cancer arising from the transitional epithelium – the highly stretchable lining of the urinary tract system – of the kidney, ureters (the tubes that carry fluid from the kidneys to the bladder), urinary bladder, urethra (the tube that carries urine from the bladder to the outside), prostate, or vagina.

Flea-control products (organophosphates and carbamate) and cyclophosphamide are possible causal agents in dogs. In addition, TCC occurs most commonly in female dogs.

Causes

Diagnosis

Your veterinarian will perform a complete physical exam on your dog, taking into account the background history of symptoms and possible incidents that might have led to this condition. You will need to provide a thorough history of your dog's health leading up to the onset of symptoms. A complete blood profile will be conducted, including a chemical blood profile, a complete blood count, a urinalysis and an electrolyte panel. Urine should also be sent for culture and sensitivity testing since a concurrent urinary tract infection is common.

X-rays of the chest and abdomen should be taken to look for possible spread of the cancer. Intravenous pyelography, a procedure that is used to take an X-ray image of the urinary system, will be used to examine the urinary tract, bladder and kidneys. For this procedure, a contrasting dye will be injected into the bloodstream, to be picked up by the kidneys and passed through through the ureters, bladder and urethra. The contrasting dye is visible on the X-ray imaging so that the internal structures can be seen and determined to be functioning normally or abnormally. Other contrast dye procedures that can be used to image the urinary tract may be used, either instead of, or in addition to, a pyelography. They include a voiding urethrogram (x-rays of dyes as the patient urinates), or vaginogram (X-rays of dyes within the vagina). These latter X-ray techniques are indicated if urethral or vaginal disease is suspected. Double-contrast cystography is the best way to visualize the mass(es) which are normally located at the trigone of the urinary bladder (a smooth triangular area inside the bladder).

For a definitive diagnosis, a biopsy of the mass is the gold standard. Biopsies may be obtained through traumatic catheterization (jamming a catheter into the masses), exploratory laparotomy (abdominal surgery), or cystoscopy (using a small camera with instruments attached). However, ultrasound-guided biopsy is not recommended, because this can easily cause further spreading of the cancer.

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